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10 William Ave, East Islip, NY 11730 Property Records

Suffolk County and Islip Town property record for 10 William Ave, East Islip, NY 11730

Property Summary

Property TypeDuplex
Lot Size0.09 acres (3,920 sqft)
Owner2 Company Names on Record
Deeds & MortgagesApr 2023 Sale
Flood ZoneZone X (minimal risk)
APN472889 372.-4-12

Property Details

APN / Parcel Number

Primary APN472889 372.-4-12
Alternative APNs
  • 0500-372.00-04.00-012.000
  • 288937200000040120000000
  • 472800771720
  • 181410

Interior

Units2 Units

Exterior

Architectural StyleDuplex Single
Lot Area3,920 sqft (0.09 acres)
Lot Width39 ft Width

Location & Zoning

Account Number181410
Street Address10 WILLIAM AVE
CityEAST ISLIP
StateNY
Zip11730-2305
Property CategoryResidential
Property TypeResidential > Multi-Unit > Duplex
Local Zoning CodeBD
Legal DescriptionX2223189Y184741 T061H00000000
Legal Block2000
Legal Lot Number400
JurisdictionSUFFOLK NY
Township / Civil DivisionISLIP
Census Block Group1
Census Block1001
Census Tract147504

Owner

Source: Suffolk County and Islip Town records, as of August 11, 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record2 Company Names on Record
Mailing Address10 WILLIAM AVE, EAST ISLIP, NY 11730-2305
Owner TypeCompany
VestingTrust, Family Trust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names2 Names on Deed
Last Transfer DateFeb 2, 2023
Transfer Doc0131970725
Record UpdatedSep 20, 2026

April 2023: Deed, Transfer

Document TypeDeed
JurisdictionSUFFOLK NY
Recording DateApr 18, 2023
Property Address10 WILLIAM AVE, EAST ISLIP, NY 11730-2305
Document Number0131970725
Book / Page13197 / 725
Instrument DateFeb 2, 2023
Transaction TypeTransfer
Record UpdatedFeb 23, 2024

Transaction

Tax$0.00
Amount AccuracyNo Consideration Stated
Additional
  • Arm's Length

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipFamily Trust
Address114 BUNGALOW WALK, OCEAN BEACH, NY 11770

Tax Assessment & Valuation

Source: Suffolk County and Islip Town assessment roll, as of August 11, 2026

Property Jurisdictions

TypeName
StateNew York
CountySuffolk County
County SubdivisionIslip Town
Unified School DistrictEast Islip Union Free School District (PK - 12)

Tax Bill & Assessment History

YearAssessed ValueAssessed Market Value
2025$30,800 (-) Land $6,800 Building $24,000
2024$433,803 (+2.54%) Land $95,775 Building $338,028
2023$30,800 Land $6,800 Building $24,000$423,077 Land $93,407 Building $329,670

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

Source: FEMA National Flood Hazard Layer, effective September 18, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood ZoneZone X
minimal risk
Flood Insurance RequirementNot required
lenders may require it
Flood Insurance CostPremium on Record
median of 14 policies
Nearby Flood Policies14 in force
Nearby Flood Claims1 (2005)
Claims Outside the SFHA1 of 1
Most Recent ClaimOct 2005 · rainfall accumulation

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Wildfire

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire RiskNot rated
no burnable land within ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water SystemSUFFOLK COUNTY WATER AUTHORITY
serves 1,100,000 people · EPA ID NY5110526
Water SourceGroundwater
Last State InspectionJan 2024
Lead1 ppb (2025–2027)
action level 15 ppb

Violations Reported to EPA

Water QualityAsbestos
resolved · Jul 2020
Treatment and ProcedureNone
last 10 years
Monitoring and ReportingNone
last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 274 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Optimum
Fiber · Cable		8,000 / 8,000
Verizon
Fiber		2,300 / 2,300
T-Mobile
Fixed Wireless		100 / 20

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